Omron SYSMAC CS Series Instruction & Reference Manual page 694

3. Instructions
D: First Destination Word
15
D Conversion result (Rightmost 4 digits)
D+1 Conversion result (Leftmost 4 digits)
 Operand Specifications
Word addresses
Area
CIO WR HR
C1 --- --- ---
C2
OK OK OK
D
Flags
Name Label
Error Flag P_ER
Carry Flag P_CY
(CJ2M CPU Units
Only)
Function
PRV2(883) converts the pulse frequency input from high-speed counter 0, according to the conversion
method specified in C1 and the pulses/revolution coefficient specified in C2, and outputs the result to D
and D+1.
Select one of the following conversion methods by setting C1 to 0000 hex or 0001 hex.
 Converting Frequency to Rotation Speed (C1 = 0 *0 hex)
If C1 is 0 *0 hex, PRV2(883) calculates the rotation speed (r/min) from the frequency data and
pulses/revolution setting. The second digit of C ( ) specifies the units and the third digit (*) specifies the
frequency calculation method.
(1) Rotation Speed Units:
• Rotation Speed Units = r/min
When the second digit of C ( ) is 0, PRV2(883) calculates the rotation speed in r/min from the
frequency data and pulses/revolution setting.
Rotation speed (r/min) = (Frequency ÷ Pulses/revolution) × 60
• Rotation Speed Units = r/s (CJM1 CPU Unit Ver. 3.0 or later only)
When the second digit of C ( ) is 1, PRV2(883) calculates the rotation speed in r/s from the
frequency data and pulses/revolution setting.
Rotation speed (r/s) = Frequency ÷ Pulses/revolution
• Rotation Speed Units = r/h (CJM1 CPU Unit Ver. 3.0 or later only)
When the second digit of C ( ) is 2, PRV2(883) calculates the rotation speed in r/h from the
frequency data and pulses/revolution setting.
Rotation speed (r/h) = (Frequency ÷ Pulses/revolution) × 60 × 60
• Range of Conversion Results
• Counter input method: Any method besides 4× differential phase mode
Frequency = 00000000 to 000186A0 hex (0 to 100,000)
Note If a frequency that exceeds 100 kHz is input, the maximum output value (100,000 decimal) will be held.
• Counter input method: 4× differential phase mode
Frequency = 00000000 to 00030D40 hex (0 to 200,000)
Note If a frequency that exceeds 200 kHz is input, the maximum output value (200,000 decimal) will be held.
(2) Frequency Calculation Method
660
0
@DM
AR T C DM EM
--- --- --- --- ---
OK OK OK OK OK
• ON if high-speed counter 0 is disabled in the settings.
• ON if C1 is not in the specified range (0000 or 0001).
• ON if the pulses/revolution setting in C2 is 0000.
• ON when functions are specified for inputs on a Pulse I/O Module when a Pulse I/O Module is not mounted to the
CJ2M CPU Unit.
• OFF in all other cases.
• ON if a high-frequency method is specified for reading the frequency of high-speed counter 0 and the data could
not be read dependably within the sampling time because the counter value was reset.
• OFF in all other cases.
Indirect DM/EM
addresses
Con-
stants
*DM
DR
@EM *EM
--- --- ---
OK
OK
OK OK
--- ---
Operation
CS/CJ/NSJ Series Instructions Reference Manual (W474)
Registers Flags
Pulse
bits
Indirect
IR TK CF
using IR
---
--- --- ---
OK
TR
bits
--- ---